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采用含叔丁基二胺的单体3,3′-二叔丁基-4,4′-二氨基二苯基-4″-叔丁基苯基甲烷(TADBP)分别与萘-1,4-二甲酸、间苯二甲酸和4,4-二苯醚二甲酸3种二酸单体通过Yamazaki膦酰化法缩聚制得一系列新型可溶性芳香聚酰胺(PA)。通过FT-IR、~1 H-NMR、TG、DSC等测试手段研究了含叔丁基芳香聚酰胺的结构与性能,以及聚合物结构对其溶解性能、热性能的影响。结果表明:PA具有优异的溶解性能,常温下不仅能溶于高沸点的N-甲基吡咯烷酮(NMP)、N,N-二甲基乙酰胺(DMAc)、N,N-二甲基甲酰胺(DMF)、二甲基亚砜(DMSO)等强极性溶剂中,加热条件下甚至能溶于四氢呋喃、氯仿、二氯甲烷等低沸点溶剂;同时,PA还具有良好的热性能,玻璃化转变温度(Tg)为188~193℃,氮气氛围下失重5%和10%时的热失重温度分别为391~416℃和404~437℃。 相似文献
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双枝[1,3,4]-噁二唑衍生物的合成与荧光性质 总被引:4,自引:0,他引:4
通过Wittig反应和Heck反应合成了三个双枝噁二唑衍生物: N-{{{3,5-二-[5-(4-叔丁基苯基)-1,3,4-噁二唑-2]-苯基}-E-乙烯基}-4-苯基}二苯胺(BBOD-2), N,N-双{{{3,5-二-[5-(4-叔丁基苯基)-1,3,4-噁二唑-2]-苯基}-E-乙烯基}-4-苯基}苯胺(BBOD-3), N,N,N-三{4-{2-{3,5-二-[5-(4-叔丁基苯基)-1,3,4-噁二唑-2]-苯基}-E-乙烯基}苯基}胺(BBOD-4). 化合物结构经过红外光谱、核磁共振谱、质谱和熔点确证, 测定了它们在不同溶剂中的紫外光谱和单光子荧光光谱. BBOD-1, BBOD-2, BBOD-3, BBOD-4在二氯甲烷中的最大吸收峰分别位于295, 390, 398和408 nm; 最大发射峰分别为360, 486, 483和487 nm. 讨论了Stokes位移与溶剂极性的关系. 相似文献
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对叔丁基苯甲醛是香精香料及其它食用化工行业的重要原料 ,采用对叔丁基甲苯气相选择性氧化制对叔丁基苯甲醛可以克服对叔丁基苯甲醛生产过程中设备腐蚀严重、污染环境、工艺落后繁琐等缺点 ,所以一直是广大科技工作者十分关注的研究课题。迄今为止 ,国内外学者已有不少关于甲苯气相选择性氧化制苯甲醛的报道[1~ 3] ,但关于对叔丁基甲苯选择性氧化制对叔丁基苯甲醛的研究几乎未见报道。本文考察了在V -Cs -Cu体系催化剂上引入助剂T1后对催化剂反应性能的影响 ,结果发现助剂T1的添加对于提高对叔丁基苯甲醛的选择性具有明显的促进作… 相似文献
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用KBH_4,CaCl_2为还原剂使D及L缬氨酸甲酯还原得到光学活性产物R-3-甲基-2-氨基丁醇(2a)及S-3-甲基-2-氨基丁醇(2b)。2a,2b同CS_2在KOH存在下反应得到(R)-4-异丙基四氢噻唑-2-硫酮(3a)及(S)-4-异丙基四氢噻唑-2-硫酮(3b)。肉桂酰氯分别同3a及3b在Et_3N存在下反应得到N-肉桂酰(R)-4-异丙基四氢噻唑-2-硫酮(4a)及N-肉桂酰(S)-4-异丙基四氢噻唑-2-硫酮(4b)。用半经验的量子化学PM3方法研究了反应物和产物的电子结构,得到了产物的最优构型和电荷键序分布以及反应焓变。 相似文献
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用紫外可见光谱法和电导法研究了乙腈溶液中一些脂肪胺与对叔丁基杯[4]芳烃间的相互作用。考察了它们之间的反应机理,测定了它们之间各步反应的平衡常数及表观复合常数等。由紫外可见光谱得到的表观复合常数和同一方法得到的文献值数量级相同但数值相差几倍。电导测定表明在乙腈溶液中脂肪胺与对叔丁基杯[4]芳烃间的反应分两步进行:首先胺从杯芳烃得到一个质子生成胺正离子和杯负离子,然后离子再进一步包合。其总复合常数远小于其表观复合常数。且在对叔丁基杯[4]芳烃的饱和溶解度以下,质子转移所生成的离子是反应的主要产物。结果与文献中结论相反。 相似文献
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Eugeny P. Ivakhnenko Pavel A. Knyazev Galina V. Romanenko Anastasiia А. Kovalenko Tatyana E. Ivakhnenko Yurii V. Revinskii Vladimir I. Minkin 《Tetrahedron》2019,75(4):538-544
New carboxyl-containing o-aminophenols and phenoxazines were synthesized by condensation of 3,5-di-(tert.-butyl)-quinone with p-aminobenzoic and anthranilic acids. Oxidative transformations of the o-aminophenols and intermediate o-iminoquinones occur with the formation of the ESR detected phenoxazinyl radicals, which furthermore transform to phenoxazines or the dimeric products emerged through the radical attack at the C1 carbon of a formed phenoxazine. Molecular structure of the dimer obtained by oxidation of methyl ester of 4-[3,5-di-(tert.-butyl)-1-(2′-hydroxyphenyl)amino]benzoic acid was X-ray determined. Reaction of 4-[3,5-di-(tert.-butyl)-1-(2′-hydroxyphenyl)amino]benzoic acid with thionyl chloride gives rise to the formation of a derivative of 2-oxido-3H-benzo[d,j][1,2,3]oxathiazol system, the structure of which was established using X-ray crystallography. Solutions of methyl-6,8-di-(tert.-butyl)-10H-phenoxazine-3-carboxylate solvents display intense fluorescence covering a broad spectral region in the range of 400–600?nm. 相似文献
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《Liquid crystals》1998,25(1):47-58
The ferric chloride mediated oxidative coupling of 3,3 ,4,4-tetrahexyloxybiphenyl with 2-hexyloxyanisole followed by demethylation gave 3,6,7,10,11-pentahexyloxy-2-hydroxyor triphenylene. Reaction with tert -butyldimethylsilyl-protected 6-bromohexanol, removal of the protecting group, and condensation with acryloyl chloride methacryloyl chloride gave acrylate and methacrylate monomers with hexamethylene 'spacers'. Alternatively, reaction of 3,6,7,10,11-pentahexyloxy-2-hydroxytriphenylene with 2-(2-chloroethoxy)ethanol followed by acryloyl chloride or methacryloyl chloride gave acrylate and methacrylate monomers with diethylenoxy 'spacers'. Both of the poly(acrylate) homopolymers and the poly(methacrylate) homopolymer with the diethylenoxy 'spacer' gave columnar liquid crystal phases. This is contrary to the current perception that the methacrylate polymer backbone is too inflexible to be incorporated in columnar phases. 相似文献
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The reaction of 6-(tert-butyl)-3-hydrazino-1,2,4-triazin-5(2H)-one with acetone and benzaldehyde yields the corresponding hydrazones. In the presence of thionyl chloride the benzaldehyde hydrazone is converted to 3-(tert-butyl)-6-phenyl-1,2,4-triazolo[4,3-b]-1,2,4-triazin-2(1H)-one and this can also be formed via the acylation of the starting hydrazinotriazinone using benzoyl chloride. 相似文献
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The catalytic system of[2-(2-benzimidazolyl)-6-((1-aryliminoethyl)pyridyl)]nickel chloride/MAO(methylalu- minoxane)was found to be good active for vinyl polymerization of norbornene and provided polymers with relative narrow molecular distributions.Various reaction parameters,such as the ratios of nickel precursor to MAO or monomer norbornene, and the nature of the ligands in complexes were carefully investigated to realize their effects on the catalytic activities, polymer molecular weight and molecular... 相似文献
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